I saw this last Saturday, but thought that it was an April 1 thing. I guess not. A Win2K server which is acting as a domain controller can't handle more than 50 IP addresses. This article shows that Microsoft knew about the bug before Win2K went gold. When customers started questioning and complaining, Microsoft first ignored them and then would only release little information about the problem. According to Microsoft, using such a configuration is "stupid" anyway. A fix is on the way, though, for people stupid enough to try this.